I got my W9 covers from Doug Lee, they are the only ones I found that would clear the 1.625 springs. He will make them to your specs for breathers, fillers and vacuum pump fittings. Very well made, no leaks.

http://propan.net/

If you want to go to the max Brett Miller is taking orders for a run of CNC W9 valve covers.

https://www.facebook.com/photo.php?fbid=...eater&ifg=1